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© Sealevel Systems, Inc. 8012e Manual | SL9225 12/2022
The diagram above diagram is representative of how lights (or other devices) can be controlled by the relay
outputs. When relay 2 on the card is closed, it will allow current to flow from the power source, into pin 12
of the DB-37, through the optocoupler, out pin 30, and back to the power source thereby turning the light
labeled “2” on.
The above diagram shows the common path to all the relays is provided external to the connector. The
common path can be provided at the connector as shown in the DB-44 diagram above. For electrical
isolation, each relay can be wired to an independent isolated circuit.
